Portable duplex grinder.



R. H. HOWARTH. PORTABLE DUPLEX GRINDER.

APPLICATION FILED JAN;6, 1913. 1,0 1,543, Patented May 13,1913.-

R. H. HOWARTH. PORTABLE DUPLEX GRINDER.

' APPLICATION FILED JAN. 6, 1913. 1,061,843.

Patented May 13, 1913.

2 SHEETS-SHEET 2.

member 25 in set position. By the provision of this adjusting means thegrinding disk together with its shaft anddriving pulley.

adapted to drive the grinding disks through the medium of the ropes orbelts 33 which ride on thepulleys 3l.an'd 34 of the disksha-fts 21 andmotor sliaft 35, respectively.

The driving ropes or belts 33 are .at all times kept under propertensiomthrough the medium of take-up devices, of which there is one foreach belt. Each of said devices consists .ofa grooved pulley 36 engagingwith its respective driving rope and mount: ed on an arm 37- whichswings loosely on a stud 38, and "has a tensioning weight39. The stud 33is carried by a slide 40 which is mounted on' the slotted bar 41,,andsaid bar 41 is adjustablymounted through the medium of slotted arms 42on the cross member 4 of the machine supporting frame. Each of theslides 40 is provided with a securing bolt 43 which engages with a slotof the bar 41 and is adapted for securing said slide in adjustedposition.

In the application of the machine for grinding the, slitter knives of apaper machine the frame is rested upon the spreader 6 and guide roller 7ofthe paper machine -as in that manner illustrated in Fig. 2. The emerydisks 10 are then adjusted on their respective hangers tobring theirgrinding surfaces into contact with the cutting edges of the slitterknife 11, and such adjustment is then secured by the means heretoforestated. The motor 32 is then operated to rotate the disks 1O andsimultaneously therewith a slitter knife being ground is turned throughthe medium of the shaft on which it is mounted. The hangers are thenadjusted to remove the grinding disks when the machine is free to bemoved bodily, by sliding along the guide roller and spreader, to bringthe grinding disks to be disposed on opposite sides of the slitter knife11 to be ground. The machine in its entirety 1 may be lifted from onepaper machine and 50 placed on another as shown in Fig. 2, when theabove-described operations may be again performed.

It is obvious that those skilled in the art may vary the details ofconstruction and arrangement of parts without departing from the spiritof myinvention, and therefore I do not wish to be limited to suchfeatures ex ept as may be required by the claims.

What I claim is 1. In a grinding machine, the combination of a support;a hanger mounted on" said .support' and comprising a swingingly--mounted on" said shaft; an-arm having a dove-tailed slidable connectionwith said bar; a journalbearing rotatably mounted on said arm, a shaftjournaled in said bearing; a grinding element mounted on said shaft; anda motor connected to drive the shaft of said grinding element,substantially as described.

3. In a duplex grinding machine, the combination of a support; a shaftmounted on said support; a pair of hangers mounted'on said shaft; a pairof grinding disks mount-ed on said hangers; means for impartinguniversal adjustment to said grinding disks; a motor mounted on saidvsupport; and driving connections between said motor and said grindingdisks.

4. In a portable duplex grinding machine, the-combination of arectangular frame; a shaft secured in hearings on said frame; a

pair of hangers swingingly mounted on said shaft; said hangerscomp-rising each a bar having a dove-tailed guideway formed therein,'anarm having a-dove-t-ailed head slidably mounted within said guideway, an

adjusting screw mounted on said bar and connected with said arm foradjusting the same, and a bolt passing through said arm and bar forsecuring the arm in different set positions; journal bearings adjustablymounted on the lower ends of said hangers;

grinding disks journaled on said journal bearings; and amotor mounted onthe frame and having driving connect-ions with said grinding disks.

In testimony whereof, I aflix my signature, in presence of twowitnesses.

ROBERT H. I-IOIVARTH.

\Vitnesses:

CHARLES E. I'Iowm'rrI, NATHEAN Hymns.

